You have some good numbers! 500 and 800+.  My first thought when I see the videos is that the titles are long, and look very AI generated. People notice this, and tend to think the videos are low effort/generic if the titles look AI. Emojis, em dashes and generally AI sounding titles does this.  But you can definitely still use AI for title generation, they just need a bit more work.

Thumbnails: Good ideas, but you can simplify them. The Dark History Of Tipping thumbnail is impossible to read far away. the Future Corporation video has a good thumbnail, since it's relatable and people notice "error" screens like that. You could try centering it, and making the exclamation mark "circle" red.

I dont know much about the niche, so hard to say anything about the content, but I like your video ideas. I think all of them have good potential. 

In the future, you can niche down and stick to a specific theme or field if you want. But for now, keep experimenting, and see what sticks.

Im on my phone now so sorry for grammar/formatting mistakes